Question

Why is a penumbra not obtained from a point source?

Answer 1

Shadows are created when a light beam coming from a source is blocked by a body.

Penumbra is the part of shadow where only partial light is blocked by the body.

In the case when light is coming from a point source, the rays radiate outwards from the source and hence are not parallel.

So, the shadow produced is as a result of the complete blocking of light.

Therefore, only umbra is formed as the shadow and no penumbra is obtained.

Photographers often use a point source of light to shoot photographs free of penumbra.

Answer 2

Answer:

scattering of light emerging from a point source does not take place this only Dark Shadow of the object placed in front of the point source is obtained hence we do not find penumbra

Explanation:

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